In order to work with others, you need training. If you want to become a good chauffeur, you first have to learn how to be a good driver. So simply taking the bodhisattva vow does not make you a bodhisattva. After you have taken the vow and gone through a trianing process, you may then finally begin to tread on the mahayana path and become a bodhisattva.
From “Making a Commitment,” in The Profound Treasury of the Ocean of Dharma, page 120.
Visit the Chogyam Trungpa Digital Library, to listen to more than 225 recordings. This recent release is three seminars on the path of the bodhisattva.